87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <OpenGL/OpenGL.h>
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#include <OpenGL/gl.h>
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#include <OpenGL/glu.h>
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#include <OpenGL/glext.h>
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#include <ApplicationServices/ApplicationServices.h>
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#include "capabilities.h"
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//#define DIAGNOSTIC 0
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static void handleBufferModes(struct glCapabilities *cap, GLint bufferModes) {
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if(bufferModes & kCGLStereoscopicBit) {
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cap->stereo = true;
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}
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if(bufferModes & kCGLDoubleBufferBit) {
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cap->buffers = 2;
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} else {
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cap->buffers = 1;
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}
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}
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static void initCapabilities(struct glCapabilities *cap) {
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cap->stereo = cap->buffers = cap->aux_buffers = 0;
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}
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enum {
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MAX_DISPLAYS = 32
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};
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/*Return true if an error occured. */
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bool getGlCapabilities(struct glCapabilities *cap) {
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CGDirectDisplayID dspys[MAX_DISPLAYS];
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CGDisplayErr err;
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CGOpenGLDisplayMask displayMask;
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CGDisplayCount i, displayCount = 0;
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initCapabilities(cap);
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err = CGGetActiveDisplayList(MAX_DISPLAYS, dspys, &displayCount);
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if(err) {
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#ifdef DIAGNOSTIC
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fprintf(stderr, "CGGetActiveDisplayList %s\n", CGLErrorString (err));
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#endif
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return true;
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}
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for(i = 0; i < displayCount; ++i) {
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displayMask = CGDisplayIDToOpenGLDisplayMask(dspys[i]);
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CGLRendererInfoObj info;
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GLint numRenderers = 0, r, accelerated = 0, flags = 0, aux = 0;
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err = CGLQueryRendererInfo (displayMask, &info, &numRenderers);
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if(!err) {
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CGLDescribeRenderer (info, 0, kCGLRPRendererCount, &numRenderers);
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for(r = 0; r < numRenderers; ++r) {
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// find accelerated renderer (assume only one)
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CGLDescribeRenderer (info, r, kCGLRPAccelerated, &accelerated);
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if(accelerated) {
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err = CGLDescribeRenderer(info, r, kCGLRPBufferModes, &flags);
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if(err) {
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CGLDestroyRendererInfo(info);
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return true;
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}
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handleBufferModes(cap, flags);
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err = CGLDescribeRenderer(info, r, kCGLRPMaxAuxBuffers, &aux);
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if(err) {
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CGLDestroyRendererInfo(info);
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return true;
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}
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cap->aux_buffers = aux;
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}
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}
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CGLDestroyRendererInfo(info);
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}
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}
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/* No error occured. We are done. */
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return false;
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}
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